[meteorite-list] Primitive Achondrite Question

From: Jeff Grossman <jngrossman_at_meteoritecentral.com>
Date: Tue, 06 Dec 2011 07:38:41 -0500
Message-ID: <4EDE0CD1.50508_at_gmail.com>

  Some PACs do in fact contain relict chondrules, especially
acapulcoites and winonaites.

Some chondrites have no chondrules (CIs and highly altered ones, plus
some type 6 and 7) and some PACs do. Life is not always simple!

Jeff

On 12/5/2011 9:22 PM, MexicoDoug wrote:
> There are relict chondrules identifyable in LL7's according to the
> definition I read, though if you dig through David Weir's or Dr.
> Bunch's websites you will probably get updated information.
>
> So, it can't be an achondrite, primitive or not. If anything it would
> have to be a "highly evolved" chondrite; --- same logic we just saw
> with Al Haggounia 001 not being an aubrite = chondrule .. not an aubrite
>
> but in that Al Haggounia case, chondrules that were not completely
> mineralized with replacements are present, and Greg Hupe has an
> unambiguous chondrule that he kindly shared with me that is extremely
> well defined (dropping it to a "3" in that case assuming not 100%
> relict).
>
> What happens when a chondrite is just past the metamorphic stage that
> chondrules are no longer identifyable is probably a variable process
> causing confusion among classifications of sparcely occuring
> chondrules in 6's and those of 7's. Must be a bit to come up with
> uniform criteria since nature has her own sometimes cryptic ways. It
> would only get interesting if different parts of the same rock get
> baked in a non-uniform oven.
>
> Kindest wishes
> Doug
>
>
> -----Original Message-----
> From: Ruben Garcia <mrmeteorite at gmail.com>
> To: Meteorite List <meteorite-list at meteoritecentral.com>
> Sent: Mon, Dec 5, 2011 8:23 pm
> Subject: [meteorite-list] Primitive Achondrite Question
>
>
> Hi all,
>
> I just bought a smallish collection and several of the slices that
> came with are NWA 3100. Mike Farmer's card was included and lists NWA
> 3100 as an LL7. The Met-Bul calls NWA 3100 a Primitive achondrite -
> not an LL7.
>
> My question is this,
>
> Does LL7 denote a particular Primitive achondrite? If so which one? If
> not then what type is this?
>
> BTW - I think Ted Bunch did the classification
>
> --
> Rock On!
>
> Ruben Garcia
>
> Website: http://www.mr-meteorite.net
> Articles: http://www.meteorite.com/blog/
> Videos: http://www.youtube.com/profile?user=meteorfright#p/u
> ______________________________________________
> Visit the Archives at
> http://www.meteoritecentral.com/mailing-list-archives.html
> Meteorite-list mailing list
> Meteorite-list at meteoritecentral.com
> http://six.pairlist.net/mailman/listinfo/meteorite-list
>
> ______________________________________________
> Visit the Archives at
> http://www.meteoritecentral.com/mailing-list-archives.html
> Meteorite-list mailing list
> Meteorite-list at meteoritecentral.com
> http://six.pairlist.net/mailman/listinfo/meteorite-list
Received on Tue 06 Dec 2011 07:38:41 AM PST